As more and more people are vaccinated, one of the major questions is whether or not the vaccines protect only from disease, or both from disease and infection. Short thread. (1/n)
Even if they completely prevent disease in a vaccinated person, there is a chance that that person can still become infected, replicate virus to a certain extent, possibly to a sufficient level to infect another (unvaccinated) person. 2/n)
The studies analyzing this feature of SARS-CoV-2 immunity are well under way. Here are results from one such study from Israel, which is ahead of the rest of the world in the vaccination process. (3/n)
medrxiv.org/content/10.110…
medrxiv.org/content/10.110…
It shows that viral load in Pfizer vaccine recipients is reduced 4-fold in people who became infected 12-28 days after receiving the first dose of the vaccine. (4/n)
These reduced viral loads suggest that even if vaccinated people become infected, they are less likely to pass the virus to others.
Remember, this is a pre-print (i.e., it's not peer-reviewed), but the results look promising. (End)
Remember, this is a pre-print (i.e., it's not peer-reviewed), but the results look promising. (End)
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